CVE-2026-90782 [MEDIUM] – S2OPC through 1.7.3 contains a null pointer dereference in msg_subscription_publish_bs__al

S2OPC through 1.7.3 contains a null pointer dereference in msg_subscription_publish_bs__alloc_notification_message_items() where a failed allocation for DataChangeNotification is overwritten by a successful allocation for EventNotificationList. Attackers can trigger heap allocation failures on sessions with both data-change and event notifications to cause the server process to terminate.